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Microsoft turned to Amazon Web Services to handle capacity overflow at GitHub after AI-driven coding demand shattered every infrastructure forecast the company had made, forcing a shift from a planned 10x expansion to a 30x rearchitecture in four months. GitHub commits hit 1.4 billion per month, Copilot error rates peaked at 21%, and the platform still needed to call in a competitor to stay online. The episode exposes the real gap between Azure's available capacity and AWS's infrastructure scale